Apparatus and method for controlling the rotary airlocks in a coal processing system by reversing the motor current rotating the air lock

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870688

Groombridge, Clifton E ^[1]

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1. Hardin, MT

An improvement to a coal processing system where hard materials found in the coal may cause jamming of either inflow or outflow rotary airlocks, each driven by a reversible motor. The instantaneous current used by the motor is continually monitored and compared to a predetermined value. If an overcurrent condition occurs, indicating a jamming of the airlock, a controller means starts a "soft" reverse rotation of the motor thereby clearing the jamming. Three patterns of the motor reversal are provided.

• Research Organization: Western Syncoal Company (Billings, MT)
• DOE Contract Number: FC22-90PC89664
• Assignee: Western Syncoal Company (Billings, MT)
• Patent Number(s): US 5575085
• OSTI ID: 870688
• Country of Publication: United States
• Language: English

Related Subjects

apparatus
method
controlling
rotary
airlocks
coal
processing
reversing
motor
current
rotating
air
lock
improvement
hard
materials
found
jamming
inflow
outflow
driven
reversible
instantaneous
continually
monitored
compared
predetermined
value
overcurrent
condition
occurs
indicating
airlock
controller
means
starts
soft
reverse
rotation
clearing
patterns
reversal
provided
air lock
motor current
predetermined value
reversible motor
reverse rotation
coal processing
condition occurs
hard material
hard materials
rotary airlock
coal process
/34/110/318/417/